If the gymnasts march immediately ahead of the veterans, then which one of the following could be the fourth group?
Only two conditions are possible because we know "exactly one group marches behind the fire-fighters but ahead of the veterans." And Gymnasts can occupy either 3rd or 5th place.
1st2nd3rd4th5th6thFire-fightersGymnastsVeteransFire-fightersGymnastsVeterans
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